Yeah, I am employed by an open source company (to be clear not open core) and most of the external code contributions we get are a net cost for us. It takes more time to review than it would have taken for our team to code and review.

The real value we get from being open source is high quality bug reports and trust from our customers, not the external contributions. The only reason we welcome external contributors is marketing and generally being welcoming. If LLMs make this cost even higher for us then we might have to stop accepting external PRs.